Honestly, ignore the free ringers on sprint.com if you can. Go to myxer.com on your computer or www.m.myxper.com on your phone and download the same ringers super easy (and usually better quality) plus, if you go onto myxer.com with your computer, you can turn any audio file into a ringer, it's pretty cool.
Is it seriously that, or does it say you are NOT allowed to have PRemium Data services? If the latter is correct, go to your Sprint.com account, go to Passwords and Settings, and look there , on your right, scroll down, and look for " Update Catalog Access - Block or allow Content Catalog purchases (such as ringers and screensavers) for each user on your account.", check your SprintPCS email, and click UpDate. Done! (be sure to log out and then log it to take effect).
If that is NOT the problem, go to your phone Press Main, then Settings then General, then UpDate data profile.
Hope this fixes the issue.
i use myxer.com and the ringtones are free....u can even make your own and assign them as caller id ringtones and/or text messaging ringtones.....its free 😃